Physics
An integrated circuit is more advantages than a coventional circuit because

They make the electric equipments more reliable and easier for servicing
A faulty part of a conventional circuit may be difficult to locate and repair
If a part of the integrated circuit fails the entire circuit is simply replaced
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Physics
RADAR is used for:

detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.
locating geostationary satellites.
receiving a signals in a radio receiver.

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Physics
Skating on ice is possible because

The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate raises its melting point

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